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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d17f7266215b5cafb56580cff7aeef33894a1816221f7e2e6260cd4eac4d28f' 
  AND token = 'Wxnud7f4I4TJwMuMPyRjfBx45hpyP2lXbvd4gJElfUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}